中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5414-5419.doi: 10.1088/1674-1056/18/12/048

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Polarized spin transport in mesoscopic quantum rings with electron--phonon and Rashba spin--orbit coupling

刘平1, 熊诗杰2   

  1. (1)Basic Department, The Jinling Institute of Technology, Nanjing 211169, China; (2)National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2009-01-24 修回日期:2009-05-04 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10474033 and 60676056) and the State Key Projects of Basic Research of China (Grant Nos 2006CB0L1000 and 2005CB623605).

Polarized spin transport in mesoscopic quantum rings with electron--phonon and Rashba spin--orbit coupling

Liu Ping(刘平)a)† and Xiong Shi-Jie(熊诗杰)b)   

  1. a Basic Department, The Jinling Institute of Technology, Nanjing 211169, China; b National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • Received:2009-01-24 Revised:2009-05-04 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10474033 and 60676056) and the State Key Projects of Basic Research of China (Grant Nos 2006CB0L1000 and 2005CB623605).

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摘要： The influence of electron--phonon (EP) scattering on spin polarization of current output from a mesoscopic ring with Rashba spin--orbit (SO) interaction is numerically investigated. There are three leads connecting to the ring at different positions; unpolarized current is injected to one of them, and the other two are output channels with different bias voltages. The spin polarization of current in the outgoing leads shows oscillations as a function of EP coupling strength owing to the quantum interference of EP states in the ring region. As temperature increases, the oscillations are evidently suppressed, implying decoherence of the EP states. The simulation shows that the magnitude of polarized current is sensitive to the location of the lead. The polarized current depends on the connecting position of the lead in a complicated way due to the spin-sensitive quantum interference effects caused by different phases accumulated by transmitting electrons with opposite spin states along different paths.

Abstract: The influence of electron--phonon (EP) scattering on spin polarization of current output from a mesoscopic ring with Rashba spin--orbit (SO) interaction is numerically investigated. There are three leads connecting to the ring at different positions; unpolarized current is injected to one of them, and the other two are output channels with different bias voltages. The spin polarization of current in the outgoing leads shows oscillations as a function of EP coupling strength owing to the quantum interference of EP states in the ring region. As temperature increases, the oscillations are evidently suppressed, implying decoherence of the EP states. The simulation shows that the magnitude of polarized current is sensitive to the location of the lead. The polarized current depends on the connecting position of the lead in a complicated way due to the spin-sensitive quantum interference effects caused by different phases accumulated by transmitting electrons with opposite spin states along different paths.

Key words: electron--phonon scattering, Rashba spin--orbit coupling, mesoscopic ring, spin polarized transport

中图分类号:  (Spin transport through interfaces)

  • 72.25.Mk
71.38.-k (Polarons and electron-phonon interactions) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 73.23.-b (Electronic transport in mesoscopic systems)